US11016604B2 - Display device - Google Patents

Display device Download PDF

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Publication number
US11016604B2
US11016604B2 US16/567,016 US201916567016A US11016604B2 US 11016604 B2 US11016604 B2 US 11016604B2 US 201916567016 A US201916567016 A US 201916567016A US 11016604 B2 US11016604 B2 US 11016604B2
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electrodes
electrode
touch detection
conductive line
shielding portion
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US16/567,016
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US20200081576A1 (en
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Naoki Takada
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Japan Display Inc
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Japan Display Inc
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Publication of US20200081576A1 publication Critical patent/US20200081576A1/en
Priority to US17/239,043 priority Critical patent/US11733802B2/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04184—Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04164—Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04107—Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04111—Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer

Definitions

  • Embodiments described herein relate generally to a display device.
  • a display device including a touch detection function (hereinafter, a display device with a touch detection function) has been adopted.
  • This display device with a touch detection function enables the detection of, for example, the contact or approach of an object such as a fingertip or stylus (external adjacent object) with respect to a display area (active area).
  • the touch detection function is realized by providing a drive electrode and a touch detection electrode. It is known that parasitic capacitance is generated between the drive electrode and the conductive line connected to the touch detection electrode.
  • a shielding portion shield pattern electrode
  • the parasitic capacitance affects the accuracy of touch detection
  • a shielding portion shield pattern electrode
  • FIG. 1 is a perspective view showing an example of the general structure of a display device according to a first embodiment.
  • FIG. 2 shows an example of the general structure of a display panel provided in the display device.
  • FIG. 3 schematically shows an example of the cross-sectional structure of the display device.
  • FIG. 4 is shown for explaining the basic operation of a touch detection mechanism.
  • FIG. 5 is shown for explaining an example of the relationship between a display period and a touch detection period in the display device.
  • FIG. 6 schematically shows the positional relationship between drive electrodes and touch detection electrodes in a comparison example of the present embodiment.
  • FIG. 7 shows an example of the connection portion of a touch detection electrode and a conductive line.
  • FIG. 8 is shown for explaining a shielding portion formed in the touch detection electrode.
  • FIG. 9 schematically shows an example of the positional relationship between the drive electrodes and the touch detection electrodes in the present embodiment.
  • FIG. 10 is shown for specifically explaining the shielding portions formed in the touch detection electrodes.
  • FIG. 11 shows a different layout example of the conductive lines connected to the touch detection electrodes.
  • FIG. 12 is shown for explaining the shielding portions formed in touch detection electrodes according to a second embodiment.
  • FIG. 13 is shown for explaining a structure in which the shielding portions are formed at positions overlapping the drive electrodes.
  • a display device for displaying an image in a display area.
  • the display device includes a plurality of first electrodes overlapping the display area, extending in a first direction and arranged in a second direction intersecting the first direction, a plurality of second electrodes overlapping the display area, extending in the second direction and arranged in the first direction, a plurality of conductive lines provided along the first electrodes and connected to the second electrodes, respectively, and a touch detection driver connected to the conductive lines and detecting contact or approach of an object with respect to the display area based on capacitance between the first electrodes and the second electrodes.
  • a shielding portion is formed in the second electrode. In a case where a distance between a conductive line near one of the second electrodes and one of the first electrodes near the conductive line is less than a predetermined value, a shielding portion is formed in the second electrode. In a case where a distance between a conductive line near one of the second electrodes and one of the first electrodes near the conductive line is greater than a predetermined value, the shielding portion is not formed in the second electrode.
  • FIG. 1 is a perspective view showing the general structure of a display device according to the present embodiment.
  • the display device of the present embodiment is a display device including a touch detection function.
  • This type of display device may be a display device including an on-cell touch detection mechanism, in which a touch panel is formed on the display surface of the display device.
  • the display device may be a display device including an in-cell touch detection mechanism, in which a common electrode for image display originally provided in the display device is also used as one of a pair of electrodes for touch detection, and the other electrode (touch detection electrode) is provided to intersect the common electrode.
  • this specification explains the display device of the present embodiment, assuming that the display device includes an in-cell touch detection mechanism.
  • the display device 10 shown in FIG. 1 includes a display panel 11 .
  • a display panel 11 for example, a display panel using a liquid crystal layer as a display function layer or a display panel using an organic emitting layer (organic electroluminescence) is used.
  • organic electroluminescence organic electroluminescence
  • the display panel 11 includes a first substrate (array substrate) ill, a second substrate (counter-substrate) 112 facing the first substrate 111 , and a liquid crystal layer (not shown) formed between the first substrate 111 and the second substrate 112 .
  • a panel driver (liquid crystal driver) 113 which drives the display panel 11 is mounted on the first substrate 111 .
  • the panel driver 113 drives the display panel 11 such that an image is displayed in the display area (active area) DA of the display panel 11 .
  • the display panel 11 is integrally structured with, for example, a capacitive change detection type of touch detection mechanism 12 .
  • the touch detection mechanism 12 includes a plurality of touch detection electrodes (second electrodes) Rx.
  • the touch detection electrodes Rx are provided at a position overlapping the display area DA of the display panel 11 on the second substrate 112 .
  • the touch detection electrodes Rx extend in an X-direction (second direction) and are arranged in a Y-direction (first direction).
  • Each touch detection electrode Rx is, for example, a transparent electrode and is formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO).
  • ITO indium tin oxide
  • IZO indium zinc oxide
  • the touch detection electrodes Rx may be provided either outside or inside the display panel 11 .
  • the touch detection mechanism 12 is connected to a touch detection driver 121 via flexible printed circuit FPC 2 .
  • a plurality of common electrodes (first electrodes) for image display as described above are provided on the first substrate 111 in the display panel 11 .
  • the common electrodes are used as one of the electrodes for touch detection, and are provided at positions facing the touch detection electrodes Rx.
  • the common electrodes are formed of, for example, ITO.
  • the display device 10 of the present embodiment it is possible to detect the contact or approach of an object (detected object) with respect to the display area DA based on capacitance (mutual capacitance) between the touch detection electrodes Rx and the common electrodes.
  • capacitance mutant capacitance
  • a host device HOS is provided outside the display panel 11 .
  • the host device HOS is connected to the display panel 11 via flexible printed circuit FPC 1 and the panel driver 113 .
  • the host device HOS is connected to the touch detection mechanism 12 via flexible printed circuit FPC 2 and the touch detection driver 121 .
  • the panel driver 113 and the touch detection driver 121 may be structures as the same chip.
  • the touch detection driver 121 and the panel driver 113 are the same chip, by providing the chip on, for example, the second substrate 112 , flexible printed circuit FPC 1 or flexible printed circuit FPC 2 , flexible printed circuit FPC 1 , flexible printed circuit FPC 2 , etc., may be omitted.
  • a backlight unit 13 is provided on the lower side of the first substrate 111 (in other words, the rear side of the display panel 11 ) as an illumination device which illuminates the display panel 11 .
  • Flexible printed circuit FPC 3 connects the backlight unit 13 and the host device HOS.
  • Various forms may be applied to the backlight unit 13 .
  • a light source for example, a light-emitting diode (LED) or a cold cathode fluorescent lamp (CCFL) is used.
  • LED light-emitting diode
  • CCFL cold cathode fluorescent lamp
  • An illumination device using a light guide and an LED or a CCFL provided on a side of the light guide may be used.
  • An illumination device using a point source in which emitting elements are arranged in a planer manner may be used.
  • the display device 10 is a reflective display device, or the display panel 11 uses organic electroluminescence, the display device 10 may not include an illumination device.
  • the display panel 11 of the present embodiment may be a transmissive display panel, a reflective display panel or a transflective display panel.
  • the display device 10 to which a transmissive display panel 11 is applied includes, as described above, the backlight unit 13 on the rear side of the first substrate 111 and includes a transmissive display function for displaying an image by selectively transmitting the light emitted from the backlight unit 13 .
  • the display device 10 to which a reflective display panel 11 is applied includes a reflective layer which reflects light on the rear side of the display panel 11 in comparison with the liquid crystal layer, and includes a reflective display function for displaying an image by selectively reflecting light from the front side (display side) of the second substrate 112 .
  • An auxiliary light source may be provided on the front side of the reflective display panel 11 .
  • the reflective layer may be structured to form the electrodes provided on the rear side of the display panel 11 in comparison with the reflective layer by a material having a reflective function, such as metal.
  • the display device 10 to which a transflective display panel 11 is applied includes the above transmissive display function and the above reflective display function.
  • FIG. 2 shows the general structure of the display panel 11 provided in the display device 10 .
  • a plurality of pixels PX are arranged in matrix in the display panel 11 .
  • FIG. 2 shows only three pixels PX.
  • Each of the pixels PX includes a pixel switch SW.
  • the pixel switches SW include a thin-film transistor (TFT), and are provided near the intersections of scanning lines G extending along the rows in which the pixels PX are arrayed and signal lines S extending along the columns in which the pixels PX are arrayed.
  • TFT thin-film transistor
  • each pixel switch SW is electrically connected to a corresponding scanning line G.
  • the source electrode of each pixel switch SW is electrically connected to a corresponding signal line S.
  • the drain electrode of each pixel switch SW is electrically connected to a corresponding pixel electrode PE.
  • the source electrode of each pixel switch SW may be connected to a corresponding pixel electrode PE, and the drain electrode of each pixel switch SW may be connected to a corresponding signal line S.
  • a gate driver GD and a source driver SD are provided in the display panel 11 to drive a plurality of pixels PX.
  • the scanning lines G are electrically connected to the output terminals of the gate driver GD.
  • the signal lines S are electrically connected to the output terminals of the source driver SD.
  • the gate driver GD sequentially applies on-voltage to the scanning lines G and applies on-voltage to the gate electrodes of the pixel switches SW electrically connected to the selected scanning lines G.
  • the source electrode and the drain electrode of the pixel switch SW become electrically conductive.
  • the source driver SD supplies an output signal corresponding to each signal line S.
  • the signal supplied to each signal line S is applied to a corresponding pixel electrode PE via a pixel switch SW in which the source electrode and the drain electrode is electrically conductive.
  • the display panel 11 further includes a common electrode driver CD.
  • the common electrode driver CD is a circuit which supplies a drive signal (in other words, applies drive voltage) to the common electrodes COME.
  • the pixel electrodes PE face the common electrodes COME via an insulating film.
  • the pixel electrodes PE, the common electrodes COME and the insulating film form storage capacitance CS.
  • the gate driver GD, the source driver SD and the common electrode driver CD are provided in an area (frame) around the display panel 11 , and are controlled by the panel driver 113 .
  • the panel driver 113 controls the operation of the backlight unit 13 .
  • the panel driver 113 controls the gate driver GD, the source driver SD, the common electrode driver CD, the backlight unit 13 , etc., to display an image in the display area DA.
  • FIG. 2 shows only a single gate driver GD.
  • the display panel 11 may include a plurality of gate drivers GD.
  • some of the scanning lines G are connected to one of the gate drivers GD, and the other scanning lines are connected to the other gate driver.
  • the two gate drivers are provided to face each other across the intervening pixels PX.
  • FIG. 3 is a figure (cross-sectional view) schematically showing the cross-sectional structure of the display device 10 .
  • FIG. 3 shows only a part of the cross-sectional structure of the display device 10 for descriptive purpose.
  • the display device 10 includes the display panel 11 , the backlight unit 13 , a first optical element OD 1 and a second optical element OD 2 .
  • the display panel 11 includes a structure corresponding to a fringe field switching (FFS) mode as a display mode.
  • the display panel 11 may include a structure corresponding to another display mode.
  • the display panel 11 includes the first substrate 111 , the second substrate 112 and the liquid crystal layer LQ as described above.
  • the first substrate 111 and the second substrate 112 are attached to each other in a state where a predetermined cell gap is formed.
  • the liquid crystal layer LQ is held in the cell gap between the first substrate 111 and the second substrate 112 .
  • the first substrate 111 is formed using a first insulating substrate 201 having a light transmitting property, such as a glass substrate or a resinous substrate.
  • the first substrate 111 includes the signal lines S, the common electrodes COME, the pixel electrodes PE, a first insulating film 202 , a second insulating film 203 , a third insulating film 204 , a first alignment film AL 1 , etc., on the side of the first insulating substrate 201 facing the second substrate 112 .
  • the pixel electrodes PE and the common electrodes COME structure pixels PX together with the pixel area of the liquid crystal layer LQ.
  • the pixels PX are arranged in matrix in the display panel 11 as described above.
  • the first insulating film 202 is provided on the first insulating substrate 201 .
  • the signal lines S are formed on the first insulating film 202 . In the example shown in FIG. 3 , the signal lines S extend in the Y-direction.
  • the scanning lines G, the gate electrodes of the switching elements (pixel switches SW) and a semiconductor layer are provided between the first insulating substrate 201 and the first insulating film 202 . Further, for example, the source electrodes and the drain electrodes of the switching elements are formed on the first insulating film 202 .
  • the second insulating film 203 is provided on the signal lines S and the first insulating film 202 .
  • the common electrodes COME are formed on the second insulating film 203 .
  • the common electrodes COME includes a plurality of segments. The segments of the common electrodes COME extend in the Y-direction (first direction) and are arranged at predetermined intervals in the X-direction (second direction).
  • the common electrodes COME are formed of a transparent conductive material such as ITO or IZO.
  • a metal layer ML is formed on the common electrodes COME such that the resistance of the common electrodes COME is made low.
  • the metal layer ML may be omitted.
  • the third insulating film 204 is provided on the common electrodes COME and the second insulating film 203 .
  • the pixel electrodes PE are formed on the third insulating film 204 .
  • Each pixel electrode PE is located between adjacent signal lines S and faces the common electrodes COME.
  • Each pixel electrode PE includes a slit SL at a position facing the common electrodes COME.
  • Each pixel electrode PE is formed of a transparent conductive material such as ITO or IZO.
  • the first alignment film AL 1 covers the pixel electrodes PE and the third insulating film 204 .
  • the second substrate 112 is formed using a second insulating substrate 205 having a light transmitting property, such as a glass substrate or a resinous substrate.
  • the second substrate 112 includes a black matrix BM, color filters CFR, CFG and CFB, an overcoat layer OC, a second alignment film AL 2 , etc., on the side of the second insulating substrate 205 facing the first substrate 111 .
  • the black matrix BM is formed on the internal surface of the second insulating substrate 205 and defines each pixel.
  • Color filters CFR, CFG and CFB are formed on the internal surface of the second insulating substrate 205 and partially overlap the black matrix BM.
  • Color filter CFR is a red color filter.
  • Color filter CFG is a green color filter.
  • Color filter CFB is a blue color filter.
  • the overcoat layer OC covers color filters CFR, CFG and CFB.
  • the overcoat layer OC is formed of a transparent resinous material.
  • the second alignment film AL 2 covers the overcoat layer.
  • the color filters, the black matrix, etc. may be formed on the first insulating substrate 201 .
  • the color filters may be stacked on, for example, the pixel electrodes PE.
  • the touch detection electrodes Rx are formed on the external surface of the second insulating substrate 205 .
  • the touch detection electrodes Rx are provided so as to extend in the X-direction. Although not shown in FIG. 3 , the touch detection electrodes Rx are arranged in the Y-direction.
  • Each touch detection electrode Rx is formed of a transparent conductive material such as ITO or IZO as described above.
  • each touch detection electrode Rx may be formed of a metal material such as aluminum (Al), titanium (Ti), silver (Ag), molybdenum (Mo), tungsten (W), copper (Cu) or chromium (Cr), an alloy prepared by combining these metal materials, a conductive organic material or a dispersing element of fine conductive substances.
  • Each touch detection electrode Rx may be a single-layer body formed of the above materials or a stacked layer body. As an example of the stacked layer body, each touch detection electrode Rx has a thin metal wire formed of the above metal materials and a transparent conductive material.
  • mesh processing may be applied. Treatment for invisibility, such as plate processing with a black material, should be preferably applied.
  • the backlight unit 13 is provided on the rear side of the display panel 11 as described above.
  • the first optical element OD 1 is provided between the first insulating substrate 201 and the backlight unit 13 .
  • the second optical element OD 2 is provided on the touch detection electrodes Rx.
  • Each of the first optical element OD 1 and the second optical element OD 2 includes at least a polarizer.
  • the first optical element OD 1 and the second optical element OD 2 may include a retardation film depending on the need.
  • FIG. 4 is shown for explaining the basic operation of the touch detection mechanism 12 described above. This specification explains the touch detection operation (in other words, the operation for detecting the contact of an object) by a mutual capacitance detection system.
  • a touch detection function is realized by, for example, the touch detection electrodes Rx formed into a stripe shape in the X-direction on the second substrate 112 and the drive electrodes Tx formed into a stripe shape in the Y-direction on the first substrate 111 . As shown in FIG. 4 , the touch detection electrodes Rx and the drive electrodes Tx intersect each other. As the drive electrodes Tx, the common electrodes COME for image display as described above are used.
  • touch detection electrodes Rx may be formed into a stripe shape in the Y-direction and the drive electrodes Tx may be formed into a stripe shape in the X-direction.
  • the drive electrodes Tx are driven by a drive signal (touch drive signal) of a radiofrequency pulse in series.
  • a low-level signal hereinafter, referred to as a touch detection signal
  • a touch detection signal is detected from a touch detection electrode Rx which an object such as a fingertip approaches in comparison with the output from the other touch detection electrodes Rx.
  • second capacitance is generated between the touch detection electrode Rx and the fingertip.
  • the touch detection electrodes Rx are capable of outputting a touch detection signal based on the change in capacitance in response to a fingertip.
  • the touch detection mechanism 12 allows the determination of the coordinate position (contact position) of the fingertip from the driving timing of the drive electrodes Tx and the position of the touch detection electrode Rx which output the low-level detection signal.
  • FIG. 5 explains an example of the relationship between a display period and a touch detection period in the display device 10 .
  • a display period includes a period for performing the display operation for displaying an image in the display area DA in the display panel 11 (in other words, the drive operation for the display pixels PX by the gate driver GD and the source driver SD).
  • a touch detection period includes a period for performing the touch detection operation for detecting the contact of an object in the touch detection mechanism 12 (for example, the operation for supplying a touch drive signal to the drive electrodes Tx and detecting a touch detection signal).
  • a plurality of common electrodes COME having a strip shape are used as the drive electrodes Tx to which a touch drive signal is supplied in a touch detection period. Since the common electrodes COME for displaying an image in the display area DA are also used as the drive electrodes Tx for touch detection, in the present embodiment, display operation and touch detection operation are performed by time-sharing.
  • a period for displaying an image of one frame by the above display operation includes a plurality of units. Each unit is divided into the above display period and touch detection period.
  • the operation for outputting a pixel signal (SIGn) of a color corresponding to a signal (SELR/G/B) selecting one of the three colors of RGB is performed for a plurality of display lines (display period)
  • the operation for supplying a touch drive signal (drive pulse TxVCOM) to the common electrodes COME as the drive electrodes Tx is performed (touch detection period).
  • one frame period includes a plurality of units. Thus, in one frame period, a display period and a touch detection period are alternately repeated.
  • the display area DA (display panel 11 ) is assumed to have an atypical shape.
  • an atypical shape is a shape different from a rectangular shape such as substantially a square or substantially a non-square rectangle (that is, a shape other than a rectangular shape).
  • this specification explains a display device in which the display area DA has a rectangular shape as a comparison example of the present embodiment.
  • FIG. 6 schematically shows the positional relationship between the drive electrodes Tx and the touch detection electrodes Rx in a comparison example of the present embodiment.
  • the drive electrodes Tx (common electrodes COME) are arranged in the X-direction so as to extend in the Y-direction.
  • the touch detection electrodes Rx are arranged in the Y-direction so as to extend in the X-direction.
  • the drive electrodes Tx and the touch detection electrodes Rx are provided at a position overlapping the rectangular display area DA.
  • conductive lines (leads) 300 are connected to the touch detection electrodes Rx, respectively.
  • the touch detection driver 121 is capable of receiving a touch detection signal from each touch detection electrode Rx via the conductive lines 300 .
  • the touch detection driver 121 is capable of detecting the contact of an object with respect to the display area DA based on this touch detection signal.
  • the conductive lines 300 connected to the touch detection electrodes Rx, respectively, are provided along the drive electrodes Tx.
  • a drive electrode Tx (hereinafter, referred to as drive electrode Tx 1 ) provided near the conductive lines 300 (in FIG. 6 , at the right end), an electric field (fringing field) may be formed between drive electrode Tx 1 and a conductive line 300 .
  • parasitic capacitance may be generated between drive electrode Tx 1 and the conductive line 300 . If parasitic capacitance is generated between drive electrode Tx 1 and the conductive line 300 , and a finger is in contact with the display area DA such that the hand is held over drive electrode Tx 1 and the conductive line 300 , a touch detection signal is output from the touch detection electrode Rx connected to the conductive line 300 .
  • This phenomenon is called a shadow effect.
  • a touch detection signal is output from the touch detection electrode Rx provided at a position different from the contact position of the finger.
  • the touch detection accuracy is decreased. Therefore, the generation of parasitic capacitance should be prevented.
  • FIG. 7 shows the connection portion of a touch detection electrode Rx and a conductive line 300 .
  • the shielding portion (shield pattern) 400 shown in the upper stage of FIG. 8 is formed in the base of the touch detection electrode Rx connected to the conductive line 300 as shown in FIG. 7 .
  • the shielding portion 400 is formed of a transparent conductive material such as ITO or IZO in a manner similar to that of the touch detection electrode Rx.
  • the shielding portion 400 According to the shielding portion 400 , the electric field formed between drive electrode Tx 1 and the conductive line 300 when a drive signal (drive pulse TxVCOM) is supplied to drive electrode Tx 1 can be blocked as shown in the lower stage of FIG. 8 . Thus, the generation of parasitic capacitance can be prevented.
  • FIG. 9 schematically shows an example of the positional relationship between the drive electrodes Tx and the touch detection electrodes Rx in the present embodiment.
  • the display area DA having an atypical shape in the present embodiment includes a portion (hereinafter, referred to as a rectangular portion) 501 equivalent to a rectangular shape and a portion (hereinafter, referred to as an atypical portion) 502 equivalent to a trapezoidal shape.
  • the drive electrodes Tx are arranged in the X-direction so as to extend in the Y-direction, and the touch detection electrodes Rx are arranged in the Y-direction so as to extend in the X-direction.
  • the drive electrodes Tx and the touch detection electrodes Rx are provided at a position overlapping the display area DA having an atypical shape.
  • the capacitance of the drive electrodes Tx and the touch detection electrodes Rx (in other words, the area of the portion in which the drive electrodes Tx overlap the touch detection electrodes Rx) is less than that of the rectangular portion 501 .
  • the signal amount of the touch detection signal output from the touch detection electrodes Rx is reduced (the touch detection signal is lessened).
  • the signal amount of the touch detection signal is further reduced by the effect of the shielding portion 400 .
  • the touch detection accuracy may be decreased.
  • the present embodiment adopts a structure in which, for example, the shielding portions 400 are formed in part of a plurality of touch detection electrodes Rx.
  • FIG. 10 shows only part of the drive electrodes Tx and the touch detection electrodes Rx for convenience sake.
  • the drive electrodes Tx arranged in the X-direction in FIG. 10 are defined as drive electrodes Tx 1 to Tx 4 in order from the side close to the conductive lines 300 .
  • the touch detection electrodes arranged in the Y-direction in FIG. 10 are defined as touch detection electrodes Rx 1 to Rx 8 .
  • touch detection electrodes Rx 1 to Rx 8 shown in FIG. 10 touch detection electrodes Rx 1 to Rx 3 are the touch detection electrodes provided at a position overlapping the rectangular portion 501 described above, and touch detection electrodes Rx 4 to Rx 8 are the touch detection electrodes provided at a position overlapping the atypical portion 502 described above.
  • the shielding portion 400 is formed in the touch detection electrode Rx.
  • the predetermined value is a value for determining that the distance between a conductive line 300 and a drive electrode Tx is less to the extent that an electric field is formed between the conductive line 300 and the drive electrode Tx to generate parasitic capacitance.
  • the conductive lines 300 connected to touch detection electrodes R 1 to R 8 are defined as conductive lines 301 to 308 , respectively. It is assumed that the distance between, of conductive lines 301 to 308 , each of conductive lines 301 to 305 and a drive electrode Tx (for example, drive electrode Tx 1 ) is less than a predetermined value.
  • the shielding portion 400 is formed in each of touch detection electrodes R 1 to Rx 5 provided near the respective conductive lines 301 to 305 .
  • the shielding portions 400 formed in touch detection electrodes Rx 1 to Rx 5 are capable of blocking an electric field formed between drive electrode Tx 1 and conductive lines 301 to 305 .
  • the shielding portion 400 is not formed in each of touch detection electrodes Rx 6 to Rx 8 provided near the respective conductive lines 306 to 308 .
  • Conductive lines 306 to 308 and drive electrodes Tx 2 to Tx 4 are not arranged side by side.
  • the distance between each of conductive lines 306 to 308 and drive electrodes Tx 2 to Tx 4 is greater than or equal to a predetermined value.
  • the shielding portion 400 is not formed in touch detection electrodes Rx 6 to Rx 8 .
  • the shielding portion 400 is formed in each of touch detection electrodes Rx 1 to Rx 5 .
  • the distance between the shielding portion 400 formed in touch detection electrode Rx 1 and the shielding portion 400 formed in touch detection electrode Rx 2 adjacent to touch detection electrode Rx 1 is assumed to be less than a predetermined value.
  • the size of the shielding portions 400 formed in touch detection electrodes Rx 1 to Rx 5 differs depending on the distance between conductive lines 301 to 305 and drive electrode Tx 1 . Specifically, for example, the size of the shielding portion 400 formed in touch detection electrode Rx 1 is determined based on the distance between conductive line 301 connected to touch detection electrode Rx 1 and drive electrode Tx 1 . For example, the size of the shielding portion 400 formed in touch detection electrode Rx 2 is determined based on the distance between conductive line 302 connected to touch detection electrode Rx 2 and drive electrode Tx 1 . In the above description, this specification explains only the shielding portions 400 formed in touch detection electrodes Rx 1 and Rx 2 . However, the above explanation is also applied to the shielding portions 400 formed in touch detection electrodes Rx 3 to Rx 5 .
  • the shielding portions 400 are formed such that the size is increased in the order of touch detection electrodes Rx 1 to Rx 5 .
  • the shielding portions 400 formed in touch detection electrodes Rx 1 to Rx 5 are formed such that the area is as large as possible depending on the positional relationship with conductive lines 301 to 305 .
  • the size of the shielding portions 400 formed in touch detection electrodes Rx 1 to Rx 5 differs depending on the distance to conductive lines 301 to 305 connected to touch detection electrodes Rx 1 to Rx 5 .
  • the area of the portion in which the shielding portion 400 formed in touch detection electrode Rx 1 overlaps drive electrode Tx 1 is substantially equal to the area of the portion in which the shielding portion 400 formed in touch detection electrode Rx 2 overlaps drive electrode Tx 1 .
  • the area of the portion in which the shielding portion 400 formed in touch detection electrode Rx 2 overlaps drive electrode Tx 1 is substantially equal to the area of the portion in which the shielding portion 400 formed in touch detection electrode Rx 3 overlaps drive electrode Tx 1 .
  • the areas of the portions in which the shielding portions 400 formed in the touch detection electrodes Rx overlap drive electrode Tx 1 are structured to be substantially equal to each other.
  • the shielding portion 400 is formed in the touch detection electrode Rx. In a case where the distance between a conductive line 300 provided near a touch detection electrode Rx and a drive electrode Tx provided near the conductive line 300 is greater than the predetermined value, the shielding portion 400 is not formed in the touch detection electrode Rx.
  • the electric field formed between drive electrode Tx 1 and conductive lines 301 to 305 can be blocked by the shielding portions 400 formed in the above touch detection electrodes Rx 1 to Rx 5 , thereby preventing the generation of parasitic capacitance between drive electrode Tx 1 and conductive lines 301 to 305 . Since the shielding portion 400 is not formed in touch detection electrodes Rx 6 to Rx 8 , in touch detection electrodes Rx 6 to Rx 8 , it is possible to avoid the reduction of the signal amount of touch detection signals caused by the shielding portion 400 .
  • the shielding portion 400 is formed in each portion considerably affected by the parasitic capacitance generated between the conductive lines 300 and the drive electrodes Tx. On the other hand, the shielding portion 400 is not formed in each portion less affected by the parasitic capacitance generated between the conductive lines 300 and the drive electrodes Tx. In this way, the reduction of accuracy of touch detection can be prevented.
  • the distance between the shielding portion 400 formed in a touch detection electrode Rx (for example, touch detection electrode Rx 1 ) and the shielding portion 400 formed in an adjacent touch detection electrode Rx (for example, touch detection electrode Rx 2 ) may be less than a predetermined value.
  • This structure can prevent the formation of an electric field between the shielding portions 400 formed in the touch detection electrodes Rx adjacent to each other. Thus, the generation of parasitic capacitance can be further prevented.
  • the size of the shielding portion 400 formed in each touch detection electrode Rx may differ depending on the distance between the conductive line 300 connected to the touch detection electrode Rx and a drive electrode Tx.
  • the shielding portion 400 when the shielding portion 400 is formed in each touch detection electrode Rx so as to be as large as possible depending on the positional relationship with the conductive lines 300 , the shielding effect by the shielding portion 400 can be improved, thereby further preventing the generation of parasitic capacitance.
  • the area of the portion in which the shielding portion 400 formed in a touch detection electrode Rx (for example, touch detection electrode Rx 1 ) overlaps a drive electrode Tx (for example, drive electrode Tx 1 ) may be substantially equal to the area of the portion in which the shielding portion 400 formed in each of other touch detection electrodes Rx (for example, touch detection electrodes Rx 2 and Rx 3 ) overlaps the drive electrode Tx.
  • This structure can equalize, in each drive electrode Tx, the area of the portion which does not overlap the shielding portion 400 (in other words, the portion which is not covered with the shielding portion 400 ).
  • a plurality of common electrodes COME for displaying an image in the display area DA are used as a plurality of electrodes Tx for detecting the contact of an object.
  • the display operation for displaying an image in the display area DA and the touch detection operation are performed by time-sharing.
  • the shielding portions 400 are formed in touch detection electrodes Rx 1 to Rx 5 .
  • the shielding portions 400 may be formed in the touch detection electrodes Rx (for example, touch detection electrodes Rx 1 to Rx 3 ) provided at a position overlapping the rectangular portion 501 structuring the display area DA, and the shielding portion 400 may not be formed in the touch detection electrodes Rx (for example, touch detection electrodes Rx 4 to Rx 8 ) provided at a position overlapping the atypical portion 502 structuring the display area DA.
  • each touch detection electrode Rx extending in the X-direction in FIG. 9 is defined as a first end
  • the left end is defined as a second end
  • the present embodiment is explained such that all the conductive lines 300 are connected to the first ends of the touch detection electrodes Rx.
  • the conductive lines 300 may be connected to the first ends of the odd-numbered touch detection electrodes Rx, and the conductive lines 300 may be connected to the second ends of the even-numbered touch detection electrodes Rx.
  • the shielding portions 400 are formed in the bases of the touch detection electrodes Rx near the conductive lines 300 .
  • the shielding portion 400 may be formed in the base of each touch detection electrode Rx or the leading end of each touch detection electrode Rx or both of them.
  • the present embodiment is explained, assuming that the display area DA (display panel 11 ) of the display device 10 has an atypical shape.
  • the display device in which the display area DA has a rectangular shape is explained as a comparison example.
  • the present embodiment may be applied to a case where the display area DA does not have an atypical shape (in other words, for example, the display area DA has a rectangular shape).
  • the display area DA may not have an atypical shape as long as, as described above, the shielding portion 400 is formed in a touch detection electrode Rx in a case where the distance between a conductive line 300 provided near the touch detection electrode Rx and a drive electrode Tx provided near the conductive line 300 is less than a predetermined value, and the shielding portion 400 is not formed in the touch detection electrode Rx in a case where the distance is greater than the predetermined value.
  • the display device 10 including the in-cell touch detection mechanism 12 may be realized as a display device including an on-cell touch detection mechanism, or may be realized as a touch panel (touch sensor) for detecting the contact or approach of an object with respect to a predetermined area (touch detection area).
  • a touch panel touch sensor
  • the present embodiment is different from the first embodiment in respect that a shielding portion is formed in a touch detection electrode Rx even in a case where the distance between a conductive line 300 provided near the touch detection electrode Rx and a drive electrode Tx provided near the conductive line 300 is greater than a predetermined value.
  • a touch detection signal is output from touch detection electrode Rx 6 .
  • the touch detection signal is input to an A/D converter (not shown) for detecting the contact of the object.
  • the touch detection signal value output from touch detection electrode Rx 6 may be less than the lower limit (minimum value) in the dynamic range of the A/D converter. Thus, the contact of the object may not be detected.
  • this specification explains a case where an object is in contact with the intersection of drive electrode Tx 2 and touch detection electrode Rx 6 .
  • the same explanation is applied to a case where an object is in contact with the intersection of drive electrode Tx 3 and touch detection electrode Rx 7 and a case where an object is in contact with the intersection of drive electrode Tx 4 and touch detection electrode Rx 8 .
  • a shielding portion (second shielding portion) 401 is formed in each of touch detection electrodes Rx 6 to Rx 8 .
  • the shielding portions 401 are formed at positions which do not overlap drive electrodes Tx 2 to Tx 4 .
  • Each shielding portion 401 is formed of a transparent conductive material such as ITO or IZO in a manner similar to that of the above shielding portions 400 .
  • the capacitance between drive electrode Tx 2 and touch detection electrode Rx 6 can be increased.
  • the capacitance between drive electrode Tx 3 and touch detection electrode Rx 7 can be increased.
  • the capacitance between drive electrode Tx 4 and touch detection electrode Rx 8 can be increased.
  • the size of the shielding portion 401 formed in each of touch detection electrodes Rx 6 to Rx 8 differs depending on the distance between conductive lines 306 to 308 and drive electrodes Tx 2 to Tx 4 .
  • the shielding portions 401 are formed in touch detection electrodes Rx 6 to Rx 8 such that the area is as large as possible depending on the positional relationship with conductive lines 306 to 308 .
  • this specification explains the shielding portions 401 formed in touch detection electrodes Rx 6 to Rx 8 .
  • the shielding portion (first shielding portions) 400 formed in touch detection electrodes Rx 1 to Rx 5 are the same as those of the first embodiment, the detailed explanation thereof is omitted here.
  • the shielding portion (second shielding portion) 401 is formed in the touch detection electrode Rx.
  • the shielding portions 401 allow the capacitance between the drive electrodes Tx and the touch detection electrodes Rx in the atypical portion 502 to be increased.
  • the variation in the capacitance between the drive electrodes Tx and the touch detection electrodes Rx in the plane of a display area DA (display panel 11 ) can be reduced.
  • the accuracy of touch detection can be improved.
  • the shielding portions 401 are formed at positions which do not overlap the drive electrodes Tx (for example, drive electrodes Tx 2 to Tx 4 ). Thus, it is possible to avoid the reduction of the signal amount of touch detection signals caused by the shielding portions 401 .
  • the size of the shielding portion 401 formed in a touch detection electrode Rx may differ depending on the distance between a conductive line 300 provided near the touch detection electrode Rx and a drive electrode Tx provided near the conductive line 300 .
  • the shielding portion 401 of each touch detection electrode Rx is formed so as to be as large as possible depending on the positional relationship with the conductive lines 300 , the capacitance between the drive electrodes Tx and the touch detection electrodes Rx in the atypical portion 502 can be further increased.
  • no shielding portion is formed in touch detection electrodes Rx 6 to Rx 8 since drive electrodes Rx 2 to Tx 4 , etc., are less affected by the generation of parasitic capacitance.
  • parasitic capacitance may be generated between conductive lines 306 to 308 and drive electrodes Tx 2 to Tx 4 . Therefore, in the present embodiment, as shown in FIG. 13 , for example, the shielding portions 401 may be formed at positions overlapping the drive electrodes Tx.
  • the capacitance between the drive electrodes Tx and the touch detection electrodes Rx in the atypical portion 502 can be increased. Moreover, the generation of parasitic capacitance between the conductive lines 300 and the drive electrodes Tx may be prevented.
  • the area of the portion in which each shielding portion 401 overlaps the drive electrode Tx is made less than the area of the portion in which each shielding portion 400 overlaps the drive electrode Tx. Therefore, it is possible to prevent the reduction of the signal amount of touch detection signals caused by the shielding portions 401 .
  • a display device for displaying an image in a display area comprising:
  • first electrodes overlapping the display area, extending in a first direction, and arranged in a second direction intersecting the first direction;
  • a touch detection driver connected to the conductive lines, and detecting contact or approach of an object with respect to the display area based on capacitance between the first electrodes and the second electrodes, wherein
  • a shielding portion is formed in the second electrode
  • the shielding portion is not formed in the second electrode.
  • a distance between the shielding portion formed in the second electrode and the shielding portion formed in an adjacent second electrode is less than a predetermined value.
  • a size of the shielding portion formed in the second electrode differs depending on a distance between the conductive line connected to the second electrode and the first electrode provided near the conductive line.
  • an area of a portion in which the shielding portion formed in the second electrode overlaps the first electrode is substantially equal to an area of a portion in which the shielding portion formed in another second electrode overlaps the first electrode.
  • a plurality of common electrodes for displaying an image in the display area are used as the first electrodes.
  • a display device for displaying an image in a display area comprising:
  • first electrodes overlapping the display area, extending in a first direction, and arranged in a second direction intersecting the first direction;
  • a touch detection driver connected to the conductive lines, and detecting contact or approach of an object with respect to the display area based on capacitance between the first electrodes and the second electrodes, wherein
  • a first shielding portion is formed in the second electrode
  • a second shielding portion is formed in the second electrode
  • the first shielding portion is formed at a position overlapping the first electrode
  • the second shielding portion is formed at a position which does not overlap the first electrode.
  • a display device for displaying an image in a display area comprising:
  • first electrodes overlapping the display area, extending in a first direction, and arranged in a second direction intersecting the first direction;
  • a touch detection driver connected to the conductive lines, and detecting contact or approach of an object with respect to the display area based on capacitance between the first electrodes and the second electrodes, wherein
  • a first shielding portion is formed in the second electrode
  • a second shielding portion is formed in the second electrode
  • an area of a portion in which the second shielding portion overlaps the first electrode is less than an area of a portion in which the first shielding portion overlaps the first electrode.
  • the display area has a shape different from a rectangular shape.
  • a touch panel comprising:
  • a plurality of first electrodes overlapping a touch detection area, extending in a first direction, and arranged in a second direction intersecting the first direction;
  • a touch detection driver connected to the conductive lines, and detecting contact or approach of an object with respect to the touch detection area based on capacitance between the first electrodes and the second electrodes, wherein
  • a shielding portion is formed in the second electrode
  • the shielding portion is not formed in the second electrode.
  • a distance between the shielding portion formed in the second electrode and the shielding portion formed in an adjacent second electrode is less than a predetermined value.
  • a size of the shielding portion formed in the second electrode differs depending on a distance between the conductive line connected to the second electrode and the first electrode provided near the conductive line.
  • an area of a portion in which the shielding portion formed in the second electrode overlaps the first electrode is substantially equal to an area of a portion in which the shielding portion formed in another second electrode overlaps the first electrode.
  • a touch panel comprising:
  • a plurality of first electrodes overlapping a touch detection area, extending in a first direction, and arranged in a second direction intersecting the first direction;
  • a touch detection driver connected to the conductive lines, and detecting contact or approach of an object with respect to the touch detection area based on capacitance between the first electrodes and the second electrodes, wherein
  • a first shielding portion is formed in the second electrode
  • a second shielding portion is formed in the second electrode
  • the first shielding portion is formed at a position overlapping the first electrode
  • the second shielding portion is formed at a position which does not overlap the first electrode.
  • a display device comprising:
  • a plurality of first electrodes overlapping a touch detection area, extending in a first direction, and arranged in a second direction intersecting the first direction;
  • a touch detection driver connected to the conductive lines, and detecting contact or approach of an object with respect to the touch detection area based on capacitance between the first electrodes and the second electrodes, wherein
  • a first shielding portion is formed in the second electrode
  • a second shielding portion is formed in the second electrode
  • an area of a portion in which the second shielding portion overlaps the first electrode is less than an area of a portion in which the first shielding portion overlaps the first electrode.
  • the touch detection area has a shape different from a rectangular shape.

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JP2020187427A (ja) * 2019-05-10 2020-11-19 株式会社ジャパンディスプレイ センサ装置
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